abstract:In mathematics, a knot is an embedding of a circle into 3-dimensional Euclidean space. The knot group of a knot K is defined as the fundamental group of the knot complement of K in R3,
We should pay attention toexamples from other fields: molecularbiologyis now drawing upon knottheoryforthe study of DNAdynamics, and subatomicphysics makesuse of abstractgroup theory.